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Σ^{+} and Σ[over ¯]^{-} Polarization in the J/ψ and ψ(3686) Decays.
Physical Review Letters ( IF 8.1 ) Pub Date : 2020-07-31 , DOI: 10.1103/physrevlett.125.052004
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Affiliation  

From 1310.6×106J/ψ and 448.1×106ψ(3686) events collected with the BESIII experiment, we report the first observation of Σ+ and Σ¯ spin polarization in e+eJ/ψ[ψ(3686)]Σ+Σ¯ decays. The relative phases of the form factors ΔΦ have been measured to be (15.5±0.7±0.5)° and (21.7±4.0±0.8)° with J/ψ and ψ(3686) data, respectively. The nonzero value of ΔΦ allows for a direct and simultaneous measurement of the decay asymmetry parameters of Σ+pπ0(α0=0.998±0.037±0.009) and Σ¯p¯π0(α¯0=0.990±0.037±0.011), the latter value being determined for the first time. The average decay asymmetry, (α0α¯0)/2, is calculated to be 0.994±0.004±0.002. The CP asymmetry ACP,Σ=(α0+α¯0)/(α0α¯0)=0.004±0.037±0.010 is extracted for the first time, and is found to be consistent with CP conservation.

中文翻译:

J /ψ和ψ(3686)衰减中的Σ^ {+}和Σ[over¯] ^ {-}极化。

1310.6×106Ĵ/ψ448.1×106ψ3686 通过BESIII实验收集的事件,我们报告了对 Σ+Σ¯- 自旋极化 Ë+Ë-Ĵ/ψ[ψ3686]Σ+Σ¯-衰变。外形尺寸的相对相位ΔΦ 被测量为 -15.5±0.7±0.5°21.7±4.0±0.8°Ĵ/ψψ3686数据。的非零值ΔΦ 允许直接和同时测量的衰减不对称参数 Σ+pπ0α0=-0.998±0.037±0.009Σ¯-p¯π0α¯0=0.990±0.037±0.011,后一个值是第一次确定。平均衰减不对称性α0-α¯0/2,计算为 -0.994±0.004±0.002。的CP 不对称 一种CPΣ=α0+α¯0/α0-α¯0=-0.004±0.037±0.010 首次提取,并发现与 CP 保护。
更新日期:2020-07-31
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